Abstract: In a spinning machine with a plurality of adjacently disposed drawing or drafting roller arrangements with which the lower rollers are arranged as lower roller cylinders extending in the machine longitudinal direction, a central control device and adjusting arrangement is provided for the adjustment of the distance of the lower roller cylinders. The central control device is linked to several locations at a lower roller cylinder or to several bearing seats of a lower roller cylinder, whereby all bearing seats of this lower roller cylinder are loosened at guide holders whereby then the bearing seats and the lower roller cylinder are simultaneously brought into the desired position by activating the control device. When in the adjusted position the bearing seats are again fixedly attached to the guide holders.

Abstract: In an open-end friction spinning machine having a plurality of spinning units, each containing two friction rollers that are arranged next to one another, form a wedge-shaped gap and are drivable in the same rotational direction by means of a belt drive, a common belt drive is employed. Each spinning unit is equipped with an automatic disengaging device for disengaging the belt drive of that unit. This disengaging device contains at least one spring-loaded tension pulley holding the belt drive in the driving position. The operational position of the tension pulley is secured by means of a locking device, and the tension pulley is automatically disengaged from the drive belt when the locking device is opened.